autoexact Ignition Coils, Iridium Spark Plugs & Wires Kit — 8-Pack UF413 Square Coils, Pre-Gapped Direct Replacement

Complete 8-pack ignition kit with square UF413 coils, pre-gapped iridium spark plugs and plug wires built as a direct replacement for select Chevy, GMC, Cadillac and related 4.8L–6.2L engines.

This all-in-one ignition replacement bundle from autoexact combines eight epoxy-sealed ignition coils, eight fine-wire iridium spark plugs and eight spark plug wires plus a wire clip to simplify a full tune-up. Designed to match factory dimensions and electrical specs, the kit targets common ignition wear items so you can replace all related parts in one visit. Read fitment notes carefully — this package uses the SQUARE UF413 coil style, not the ROUND UF414 — and verify your original coil shape before ordering.

Will these coils and plugs fit my Chevy or GMC?

Compatibility is targeted to specific GM V8 and V6 engines in model years listed; the product replaces coils and plugs used across many 4.8L, 5.3L, 6.0L and 6.2L applications. Use your vehicle’s year, model and engine displacement to confirm fit, and check that your existing coils are the square UF413 design. If you’re uncertain, provide your VIN to seller support for verification.

• Includes 8 square UF413 coils — verify coil shape matches your vehicle.
• Fits many Silverado, Sierra, Tahoe, Suburban, Yukon, Avalanche, Express and similar models as listed.
• Compatible with 14mm threaded, tapered-seat spark plug specifications and preset 1.3mm gap.
• Seller offers VIN-based fitment help to avoid ordering mistakes.

How does this kit help with ignition-related drivability issues?

When coils, spark plugs or plug wires wear, you may see symptoms like misfires, rough idle, poor acceleration or a check-engine light. Replacing coils and plugs together reduces the chance of repeating repairs and can restore consistent spark delivery when ignition component wear is the root cause. The kit is engineered to meet factory electrical output and insulation expectations for reliable day-to-day performance.

• Epoxy-potted coils resist moisture, heat and internal arcing for steady spark output.
• Fine-wire iridium plugs are pre-gapped to help stable ignition and combustion.
• Durable rubber boots and spring contacts secure connections under vibration.
• Designed to address common trouble codes related to misfires (e.g., P0300–P0308).

What should I know about installation and technical specs?

The kit is built for a straightforward, direct-replacement installation using basic hand tools and a torque wrench. Plugs come pre-gapped and the recommended installation torque is 11.06 ft·lb (15 N·m). Coils are factory-tested for high-voltage output to help ensure insulation strength and proper function before shipping.

• Complete kit: 8 coils, 8 iridium plugs, 8 plug wires and 1 wire clip for a single-vehicle tune-up.
• Plugs are preset and interchangeable across specified heat ranges (heat range 5 or 6 equivalents).
• Each coil tested at approximately 35±2 kV secondary output during quality checks.
• Factory-applied dielectric grease and pre-lubrication streamline installation.

What warranty and support are included if something goes wrong?

autoexact backs this ignition set with a two-year warranty plus lifetime technical assistance to help diagnose fit or installation questions. If you run into compatibility uncertainty, sending your VIN or vehicle details to customer support helps ensure you get the correct coil style and parts for your vehicle.

• 2-year warranty coverage on the ignition kit.
• Lifetime technical support by email for fitment and installation help.
• Quality-checked components before shipment to reduce returns.

Who this is for: This kit is intended for owners or professional mechanics replacing worn ignition components on compatible Chevy, GMC, Cadillac, Pontiac, Hummer and other listed GM-platform vehicles with 4.8L–6.2L engines who want a full, single-source replacement. Choose this set if you prefer to swap coils, plugs and wires together to minimize future troubleshooting — but confirm that your vehicle uses the square UF413 coil type before ordering.